How to avoid busy roads when cycling: find quieter routes
Read road classes, heatmaps and cycle networks to plan quieter routes, and know what to do when a main road can't be avoided.
The short answer
To avoid busy roads cycling, plan on the minor road classes, check heatmaps and signed cycle networks, and ride any busy stretch at a quiet hour. Main roads, such as UK A roads, US state highways and Australian A routes, carry the most traffic, and many motorways and freeways ban bikes. Check every stretch before you ride.
Key takeaways
- A road's class is the best free clue to its traffic. Plan on the bottom two tiers.
- Bikes are banned on UK motorways and South African freeways; US interstate rules vary by state.
- Heatmaps show where riders already go, but a bright main road may simply have no alternative.
- Signed cycle networks help, but some sections still use main roads.
- Ride an unavoidable busy stretch at its quietest hour, and keep it short.
Definitions
- Road class
- The official rank a road has in its country's network, from motorways and national routes down to local and unclassified roads.
- Heatmap
- A map coloured by how many people have recorded rides or runs along each road or path.
- Paved shoulder
- The surfaced strip beside the traffic lane, outside the edge line, where a rider can sit clear of passing vehicles.
What do you need to avoid busy roads cycling?
You need a route planner, a map that shows road classes, a cycling heatmap and street-level imagery. To avoid busy roads cycling, read each road's class first, then check it against heatmaps and cycle networks. It's one step in planning a cycling route, before the climbs and the wind.
A planner's cycling profile picks roads that suit a bike, but it can't know how busy a road is on your day. OpenStreetMap, the open map many planners build on, labels roads motorway, trunk, primary, secondary, tertiary and smaller.
Step 1: How do road classes tell you how busy a road is?
A road's class is the best free clue to its traffic: the higher the class, the busier it usually is. Each country names its classes differently, but the pattern holds. Avoid the top tier, use the main roads with care, and plan most of the ride on the bottom two.
| Country | Bikes banned or restricted | Main roads: usually busy | Linking roads: mixed | Usually quietest |
|---|---|---|---|---|
| UK | Motorways (M roads): banned | A roads, especially green-signed primary routes | B roads | C roads and unclassified lanes |
| US | Interstates: varies by state | US routes and state highways | County roads | Local and farm roads |
| Australia | M routes: banned on urban freeways, some rural shoulders open where signed | A routes (national significance) | B routes (state significance) | C routes and unnumbered roads |
| South Africa | Freeways, including parts of N routes: banned | N routes, and M routes in cities | R routes (provincial and regional) | Unnumbered roads, often gravel |
Unclassified roads make up about 60% of the UK network, says the Department for Transport, so there's usually a quieter option. In Victoria, Australia, some regional freeway shoulders are open to bikes where signs allow (RACV). In South Africa, regulation 323 bans pedal cycles on every freeway.
A class is a clue, not a traffic count. A B road into a city at rush hour can be busier than an A road across a moor.
Want this for your own route? Windline shows the wind for every stretch, timed to your pace. Free. Make a free ride page →
Step 2: How do heatmaps show where cyclists ride?
A heatmap shows where riders already go, which is good evidence that a road is bearable on a bike. Strava's Global Heatmap is free, built from a year of public activities and updated monthly; its Weekly and Night heatmaps are for subscribers (Strava, October 2026).
- Set it to cycling. Running lines tell you little about roads.
- Bright doesn't mean pleasant. A glowing main road may simply be the only way through.
- Dim doesn't mean busy. Brightness follows population, so a rural lane may just have few riders nearby.
Step 3: Can cycle networks keep you off busy roads?
Mostly, yes. Signed networks are chosen for bikes, but some sections still run on main roads, so check each one.
- EuroVelo: 17 long-distance routes across Europe, totalling 91,812 km (57,049 miles) in its September 2025 report, with 63,157 km (39,244 miles) ready to cycle. The Rhine cycle route is EuroVelo 15.
- US Bicycle Route System: 38,856 km (24,144 miles) of numbered routes after the fall 2025 additions (Adventure Cycling, January 2026). They use existing roads and trails, so traffic varies.
- National networks: in its own 2018 review, the charity that runs the UK's National Cycle Network found only 54% of its paths safe for a 12-year-old to use alone.
Step 4: When are the roads you can't avoid at their quietest?
Usually early on a weekend morning. Avoid weekday commuting peaks near towns, school-run times, and holiday traffic on scenic roads: the Great Ocean Road's official cycling guide calls early morning the safest time to ride. Inland, winds are often lighter in the morning too (see the best time of day to cycle to avoid wind). A big group is harder to pass, so a group ride needs the quietest timing of all.
How do you check the road class along your whole route?
Go through it stretch by stretch and note every section on a top-tier road. Many planners show a breakdown of road types for the whole route as a first pass. Then zoom along the line, looking hardest where it joins a bigger road, crosses a river or enters a town. Our checklist for checking a cycling route covers the rest.
What if a busy road can't be avoided?
Sometimes the only bridge or pass is a main road. Make that stretch short and calm.
- Look for a shoulder in street-level imagery, and note where it narrows or ends.
- Find a parallel road: old alignments, service roads and rail trails often run alongside.
- Change the hour, or skip it with a short train or ferry hop.
- Never plan on a banned road, even if the line looks shorter.
What should you check after the traffic?
Check that the quiet roads are rideable. The quietest are often gravel, so check whether each road is paved. Then check the climbs and the wind, and preview the route.
Frequently asked questions
Is it legal to cycle on an A road in the UK?
Yes. The Highway Code bans cyclists from motorways (rule 253), but A roads are open to bikes unless a sign says otherwise. Some A roads are fast dual carriageways with a 70 mph (113 km/h) national limit, and some are green-signed primary routes linking cities, so legal doesn't mean pleasant. Look for a parallel B road or lane first, and ride any A road stretch at a quiet hour.
Can you ride a bike on an interstate in the US?
It varies by state. Some largely rural western states, such as Wyoming, open interstate shoulders to bikes outside cities, often because the interstate is the only paved road through. Many other states ban bikes from interstates, and even states that allow them sign closures near cities and through tunnels. Check the state transport department's rules and the signs on the on-ramp before you plan on one.
Are bicycles allowed on freeways in South Africa?
No. Regulation 323 of the National Road Traffic Regulations says no person shall operate a pedal cycle on a freeway. Many N routes are freeways near cities but ordinary two-lane roads elsewhere, so the ban applies only where the road is signposted as a freeway. Plan an R route or an unnumbered road instead, and check where each freeway section begins and ends.
Is a quiet road always the better choice?
Not always. A quiet road can be gravel, steep, narrow, unlit, or far from help if something goes wrong, and it may add many kilometres. A wide paved shoulder on a busier road can feel calmer than a narrow lane with blind bends. Weigh traffic against surface, climbing, distance and daylight, and check the surface before you commit to a minor road.
How do you find quiet roads in a country you don't know?
Start with the national or EuroVelo cycle route through the area, then compare it with a cycling heatmap. Look at routes published by local clubs, bike shops and tourist offices, which usually know the quiet back roads. Read the road classes on the map to fill the gaps, and check any main-road section in street-level imagery before you commit to it.
Get the wind for your ride.
Upload a GPX, add your start time and pace, and see the headwind, gusts, rain and heat for every stretch of the route, timed to when you’ll be there. Free for riders.
Make a free ride page →Sources and method
- UK Department for Transport (2012). Guidance on road classification and the primary route network
- GOV.UK, The Highway Code (2026). Motorways (253 to 273): rule 253, prohibited vehicles
- Arrive Alive (South Africa) (2026). Cycling, rules of the road and road safety (National Road Traffic Regulations, regulation 323)
- RACV (2026). Bike rules for beginner cyclists in Victoria
- Wikipedia (2026). Non-motorized access on freeways (United States interstate access by state)
- EuroVelo (European Cyclists' Federation) (2025). Advancing EuroVelo, insights from the 2025 route development status report
- Adventure Cycling Association (2026). Introducing the fall 2025 additions to the United States Bicycle Route System
- Strava (2026). A guide to Strava heatmaps
- Road Safety GB (2018). National Cycle Network risks 'falling short of its potential' (Sustrans Paths for Everyone review)
No traffic counts are used: the road-class table describes each country's official classes and what they are designed to carry, not measured traffic. Network lengths are as published (EuroVelo, September 2025; US Bicycle Route System, fall 2025 additions announced January 2026), converted at 1 mile = 1.609 km and rounded. The 70 mph dual-carriageway limit is the UK national speed limit, converted at 1 mph = 1.609 km/h.
About the author
Wes Thomson, Founder, Windline. Wes Thomson builds Windline, live wind and weather forecasts timed to when riders reach each stretch of road. He built it for his own 2,093 km tour from Pont Drift to Cape Town, and writes these guides with the same focus: what the wind will do to your ride, and how to plan around it.